diff --git a/packages/vite/package.json b/packages/vite/package.json
index 349ade9a..a9e9a6c7 100644
--- a/packages/vite/package.json
+++ b/packages/vite/package.json
@@ -67,6 +67,7 @@
     "@types/codemirror": "catalog:types",
     "@types/diff": "catalog:types",
     "@types/split2": "catalog:types",
+    "@types/splitpanes": "catalog:types",
     "@types/stream-json": "catalog:types",
     "@unocss/nuxt": "catalog:build",
     "@vueuse/components": "catalog:frontend",
diff --git a/packages/vite/src/app/splitpanes.d.ts b/packages/vite/src/app/splitpanes.d.ts
deleted file mode 100644
index 5491c862..00000000
--- a/packages/vite/src/app/splitpanes.d.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-// TODO install @types/splitpanes once updated
-declare module 'splitpanes' {
-  import type { Component } from 'vue'
-
-  export interface SplitpaneProps {
-    horizontal: boolean
-    pushOtherPanes: boolean
-    dblClickSplitter: boolean
-    firstSplitter: boolean
-  }
-
-  export interface PaneProps {
-    size: number | string
-    minSize: number | string
-    maxSize: number | string
-  }
-
-  export type Pane = Component<PaneProps>
-  export const Pane: Pane
-  export const Splitpanes: Component<SplitpaneProps>
-}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2dc85bd2..810b56ca 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -327,6 +327,9 @@ catalogs:
     '@types/split2':
       specifier: ^4.2.3
       version: 4.2.3
+    '@types/splitpanes':
+      specifier: ^2.2.6
+      version: 2.2.6
     '@types/stream-json':
       specifier: ^1.7.8
       version: 1.7.8
@@ -738,6 +741,9 @@ importers:
       '@types/split2':
         specifier: catalog:types
         version: 4.2.3
+      '@types/splitpanes':
+        specifier: catalog:types
+        version: 2.2.6
       '@types/stream-json':
         specifier: catalog:types
         version: 1.7.8
@@ -2512,6 +2518,9 @@ packages:
   '@types/split2@4.2.3':
     resolution: {integrity: sha512-59OXIlfUsi2k++H6CHgUQKEb2HKRokUA39HY1i1dS8/AIcqVjtAAFdf8u+HxTWK/4FUHMJQlKSZ4I6irCBJ1Zw==}
 
+  '@types/splitpanes@2.2.6':
+    resolution: {integrity: sha512-3dV5sO1Ht74iER4jJU03mreL3f+Q2h47ZqXS6Sfbqc6hkCvsDrX1GA0NbYWRdNvZemPyTDzUoApWKeoGbALwkQ==}
+
   '@types/stream-chain@2.1.0':
     resolution: {integrity: sha512-guDyAl6s/CAzXUOWpGK2bHvdiopLIwpGu8v10+lb9hnQOyo4oj/ZUQFOvqFjKGsE3wJP1fpIesCcMvbXuWsqOg==}
 
@@ -2951,6 +2960,9 @@ packages:
   '@vue/compiler-dom@3.5.26':
     resolution: {integrity: sha512-y1Tcd3eXs834QjswshSilCBnKGeQjQXB6PqFn/1nxcQw4pmG42G8lwz+FZPAZAby6gZeHSt/8LMPfZ4Rb+Bd/A==}
 
+  '@vue/compiler-sfc@2.7.16':
+    resolution: {integrity: sha512-KWhJ9k5nXuNtygPU7+t1rX6baZeqOYLEforUPjgNDBnLicfHCoi48H87Q8XyLZOrNNsmhuwKqtpDQWjEFe6Ekg==}
+
   '@vue/compiler-sfc@3.5.26':
     resolution: {integrity: sha512-egp69qDTSEZcf4bGOSsprUr4xI73wfrY5oRs6GSgXFTiHrWj4Y3X5Ydtip9QMqiCMCPVwLglB9GBxXtTadJ3mA==}
 
@@ -5641,6 +5653,11 @@ packages:
     resolution: {integrity: sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==}
     engines: {node: '>= 0.8.0'}
 
+  prettier@2.8.8:
+    resolution: {integrity: sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==}
+    engines: {node: '>=10.13.0'}
+    hasBin: true
+
   pretty-bytes@7.1.0:
     resolution: {integrity: sha512-nODzvTiYVRGRqAOvE84Vk5JDPyyxsVk0/fbA/bq7RqlnhksGpset09XTxbpvLTIjoaF7K8Z8DG8yHtKGTPSYRw==}
     engines: {node: '>=20'}
@@ -6769,6 +6786,10 @@ packages:
     peerDependencies:
       vue: ^3.2.0
 
+  vue@2.7.16:
+    resolution: {integrity: sha512-4gCtFXaAA3zYZdTp5s4Hl2sozuySsgz4jy1EnpBHNfpMa9dK1ZCG7viqBPCwXtmgc8nHqUsAu3G4gtmXkkY3Sw==}
+    deprecated: Vue 2 has reached EOL and is no longer actively maintained. See https://v2.vuejs.org/eol/ for more details.
+
   vue@3.5.26:
     resolution: {integrity: sha512-SJ/NTccVyAoNUJmkM9KUqPcYlY+u8OVL1X5EW9RIs3ch5H2uERxyyIUI4MRxVCSOiEcupX9xNGde1tL9ZKpimA==}
     peerDependencies:
@@ -8728,6 +8749,10 @@ snapshots:
     dependencies:
       '@types/node': 24.10.1
 
+  '@types/splitpanes@2.2.6':
+    dependencies:
+      vue: 2.7.16
+
   '@types/stream-chain@2.1.0':
     dependencies:
       '@types/node': 24.10.1
@@ -9326,6 +9351,14 @@ snapshots:
       '@vue/compiler-core': 3.5.26
       '@vue/shared': 3.5.26
 
+  '@vue/compiler-sfc@2.7.16':
+    dependencies:
+      '@babel/parser': 7.28.5
+      postcss: 8.5.6
+      source-map: 0.6.1
+    optionalDependencies:
+      prettier: 2.8.8
+
   '@vue/compiler-sfc@3.5.26':
     dependencies:
       '@babel/parser': 7.28.5
@@ -12445,6 +12478,9 @@ snapshots:
 
   prelude-ls@1.2.1: {}
 
+  prettier@2.8.8:
+    optional: true
+
   pretty-bytes@7.1.0: {}
 
   process-nextick-args@2.0.1: {}
@@ -13702,6 +13738,11 @@ snapshots:
       vue-observe-visibility: 2.0.0-alpha.1(vue@3.5.26(typescript@5.9.3))
       vue-resize: 2.0.0-alpha.1(vue@3.5.26(typescript@5.9.3))
 
+  vue@2.7.16:
+    dependencies:
+      '@vue/compiler-sfc': 2.7.16
+      csstype: 3.2.3
+
   vue@3.5.26(typescript@5.9.3):
     dependencies:
       '@vue/compiler-dom': 3.5.26
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 0a94c1d0..e3245533 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -136,6 +136,7 @@ catalogs:
     '@types/d3-hierarchy': ^3.1.7
     '@types/diff': ^8.0.0
     '@types/split2': ^4.2.3
+    '@types/splitpanes': ^2.2.6
     '@types/stream-json': ^1.7.8
     '@types/ws': ^8.18.1
 onlyBuiltDependencies: